40991880 has 64 divisors (see below), whose sum is σ = 124104960. Its totient is φ = 10830848.

The previous prime is 40991869. The next prime is 40991891. The reversal of 40991880 is 8819904.

It is an interprime number because it is at equal distance from previous prime (40991869) and next prime (40991891).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12049 + ... + 15071.

It is an arithmetic number, because the mean of its divisors is an integer number (1939140).

Almost surely, 2^40991880 is an apocalyptic number.

40991880 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40991880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62052480).

40991880 is an abundant number, since it is smaller than the sum of its proper divisors (83113080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40991880 is a wasteful number, since it uses less digits than its factorization.

40991880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3150 (or 3146 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 40991880 is about 6402.4901405625. The cubic root of 40991880 is about 344.7989586947.

The spelling of 40991880 in words is "forty million, nine hundred ninety-one thousand, eight hundred eighty".